Kinetics and mechanisms of bacteriophage PR772 inactivation by monochloramine

Cong, Wen

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https://hdl.handle.net/2142/101289 Copy

Description

Title

Kinetics and mechanisms of bacteriophage PR772 inactivation by monochloramine

Author(s)

Cong, Wen

Issue Date

2018-04-10

Director of Research (if dissertation) or Advisor (if thesis)

Mariñas, Benito J.

Department of Study

Civil & Environmental Eng

Discipline

Environ Engr in Civil Engr

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• bacteriophage PR772
• monochloramine
• disinfection
• drinking water

Abstract

With billions of people living with unsafe drinking water sources, ensuring safe drinking water remains a challenging task for environmental engineers and researchers. Human Adenovirus (HAdV) is a pathogen listed in the Contaminant Candidate List 4 of the United States Environmental Protection Agency. HAdV is highly resistant to monochloramine, a common drinking water disinfectant used in the United States and other countries around the world. PR772 is believed to relate evolutionarily to HAdV, which makes PR772 a potential surrogate virus for HAdV. Previous research characterized the monochloramine inactivation kinetics of both viruses, and found that the inactivation kinetics at high pH and high temperature was characterized by a phase of slower rate followed by faster rate, which was different from the more common fast-slow or tailing kinetics observed for other pH-temperature combinations, for both viruses as well as for other microorganisms. This thesis further characterized the kinetics of PR772 inactivation by monochloramine at high pH and high temperature, and proposed a two-reaction model to describe the data. Molecular analyses at various stages of the replication cycle were used to determine which viral replication step was hindered by monochloramine disinfection at pH 8.0-30.0℃ (baseline condition) and pH 10.5-30.0℃ (high pH and high temperature condition). The results showed that early mRNA synthesis, DNA production and late mRNA synthesis were all inhibited. Different from previous research on lower temperature and pH, partial genome damage and loss in viral attachment were observed. No difference between the two pH levels investigated was observed.

Graduation Semester

2018-05

Type of Resource

text

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http://hdl.handle.net/2142/101289

Copyright and License Information

Copyright 2018 Wen Cong

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